A propeller is exposed to all sorts of attacks underwater, such as rusting and adhesions of the sea. It is the key piece of the ship’s propulsion system, and thus deserves special attention. The propeller is the element that allows the transformation of the mechanical energy of the engine into propulsion. A propeller in poor state is a disaster. If it is unbalanced, it will vibrate and end up damaging the transmission axis. If it is bent or hit it makes matters worse, since in addition to being unbalanced, it will produce serious chafing that will result in low performance quality.